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Although the thixotropic behaviour of geological materials (made manifest by the isothermal, reversible, gel-sol-gel transformation has been utilized in many industries, the thixotropy of naturally occurring sediments appears to have been but little studied. The results of a preliminary examination of a representative series of unconsolidated rocks are therefore presented. Excepting coarse clean sands and gravel, and sediments prove to be capanble to assuming the thixotropic state, the degree of thixotropy depending on grain-size, grading, mineralogical composition and the presence of electrolytes. Thixotropic values and their range are given for a large selection of sediments from Britain and abroad, and notes are added on the problems presented by some of the more interesting materials.

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